Mold carrier in die casting machines under pressure



. P 1940- J. VONTOBELET AL- 2,216,060

MOLD CARRIER IN DIE CASTING MACHINES UNDER PRESSURE Filed May 27, 1938 2Sheets-Sheet l I l- 22 I8 2! 74a 22 23 2o 21 J Wmib i i 7 Q l 2 Sept.24, 1940. J VQNTQBEL ET AL 2,216,060

MOLD CARRIER IN DIE CASTING MACHINES UNDER PRESSURE Filed May 2'7, 19382 Sheets-Sheet 2 J vmckei Patented Sept. 24, 1940 v UNITED STATES MOLDCARRIER IN DIE CASTING MACHINES UNDER PRESSURE Jakob Vontobel,Teufenthal, Switzerland, assignor to the firm InjectaAktlengesellschaft,

Teutenthal, Canton Argovie, Switzerland Application May 27, 1938, SerialNo. 210,530

In Switzerland May 29, 1937 4 Claims.

The present invention relates to a mold carrier in die casting machinesunder pressure.

There are die casting machines under pressure in which the movable halfof the mold is carried 5 by a slide controlled by a manually orhydraulically operated closing mechanism and is pressed against thestationary mold by hydraulic pressure. This movable half of the mold ismostly provided with devices (such as the pins for the cores and pinsfor'the expelling of the casting) which must be b ought into a relationwith certain determined portions of said slide.

All these devices combined with the movable half of the mold and whichaccording to the length of the core must be greatly extended to theoutside of said mold, rendered the mounting of said movable molddifficult. After having dismounted a part of the machine it wasnecessary to introduce said mold from the front side and to find meansfor adjusting the correct relative position of mold and accessories. Thefixing of a new mold was always a tedious task which often neededfurther correction after having made several test castings.

The present invention consists in a mold carrier in which the movablehalf of the mold is carried by a slide combined with the closingmechanism of the mold and which is characterized in that all parts whichhave to receive said half of the mold and the device for the Withdrawalof the cores and the expelling of the casting are accessible to permitthat the mentioned devices may be put easily into their place fromabove.

Preferably the core withdrawing means and the expeller plates arecombined in such a way that they permit the simultaneous introducing ofall the devices from above and the subsequent fastening of theseportions of the movable mold.

The annexed drawings illustrate an embodiment of a mold carrieraccording to the invention and combined with a hydraulically operatedmachine but of course this could also be a hand operated machine.

Fig. 1 is a sectional elevation on line 1-1 of Fig. 3 the corewithdrawing and expelling devices being removed,

Fig. 2 a plan of the parts shown in Fig. 1,

Fig. 3 a plan section on line III-III in Fig. 1

the withdrawing and expelling devices being shown,

Fig. 4 a section on line IV-IV in Fig. 1 and Fig. 5 a section on lineV-V in Fig. 1. According to the drawing a slide l is slidably held byrods 2 to press the movable mold'portion 5 by means of a piston in apressure cylinder not shown against the stationary portion 4 held by theleft standard 3 of the machine. This slide is arranged to receive thewhole movable mold portion comprising (see Fig. 1) the half 5 of the 5mold, the device 6 for withdrawing the cores and the expelling device Ifor expelling the casting the devices including, respectively, the usualcore pins to and ejector pins la as shown in Fig. 3.

The movable mold portion 5 is fastened with 10 screws 8 to anintermediate piece Shaving vertical flanges 9a removably clamped againsta shoulder l0 of a vertical guide slot in Illa in the slide l. Behindthis intermediate piece 9 the slide has a bore lb to receive and guidethe two- 5 part body member ll--l la of the core withdrawing device. Theupper half of the wall forming the bore lb is in the form of a holderpivotally mounted at l2a whereby it may be swung to open position toafford access to the core withdrawing and expelling devices as will behereinafter more fully described. The holder I2 is held in operativeposition by a clamping bolt l2b. Y

/ The core withdrawing plate I3 is fitted into a groove llc of the twopart body member and is 5 provided with several cores extending intothe, mold. This arrangement is known and shall not be described.

The upper and lower parts ll-l la are divided along the line llb, Fig.1, and the upper part is removable. A segment l5 forming a portion ofthe upper body part and two segments l4 and Ma forming portions of thelower body part pass through openings l6, llia and l! of a frame l8which, together with the expeller plate l9 constitute the expellingdevice. The segments l4 and Ida are fixed to a connecting piece 20 andthe third segment I5 is removably secured thereto by a bolt lib. Theconnecting piece 20 is attached to the ends of rods 20a. By thisarrangement the said member is connected to the pres- 40 sure cylinderby means not represented.

The described construction shows that after opening the holder l2 themovable mold portion 5 can be inserted from above into the guides Illaof the slide, where the intermediate piece 9 is 45 held, the corewithdrawing plate l3 can be inserted into the groove llc of the two partcore withdrawing member ll, Ila, and the expeller plate l9 can be slidalong the expelling frame l8. 0 Having inserted this mold portion thecore withdrawing member may be clamped fast by applying the bolt lib tothe hinged holder l2. The expeller plate I9 is now located between theexpeller, frame l8 and the eccentrics 22 secured to the rods 23 passingthrough the hollow rods 2| and may then be clamped fast by tighteningthe screws 23 of the rods 23.

At the front end the intermediate piece 8 is clamped fast against theshoulder III by means of angular levers 24 in the axial direction of themold. These levers 24 are swingingly mounted on slide I by means ofpivots 28. This clamping is efl'ected by means of pressure screws 25operating inwardly on the levers. Since the pivot 26 of these levers islocated at the end of its longer arm which is parallel with thelongitudinal axis of the machine the screwing up of said screws willclamp the intermediate piece 9 down upon shoulder i0. According to Fig.4 there are four levers 24 symmetrically arranged in relation to therods 2 thus affording a secure fastening of the movable mold. Besidesthis, intermediate piece 9 bears against the parts I of slide i.

Due to the core withdrawing member being made in two parts and due tothe hinged holder i 2, the inserting of the whole mold from above intothe slide offers no difficulties. Also the combination of this corewithdrawing device with the expeller frame forms a secure fastening ofthe expelling tools.

In the present embodiment of the invention the core withdrawing memberis tubular. This is technically the best form, but the invention is notlimited to this form. The connection with the closing cylinder couldalso be effected across the expeller frame.

What I claim is:

1. In a machine for die casting under pressure having a movablemold-portion and a core-plate and core-pins and an ejector-plate andejectorpins, a slide open at the top, carrying said movable moldportion, a hollow two-part core withdrawing member slidably arranged insaid slide and carrying said core-plate, one part of the withdrawingmember being removably positioned on the other part after havinginserted the movable mold-portion and core-plate with core-pins and theejector-plate with the ejector-pins from above, and a hinged holdermounted on said slide and adapted to be turned down and fastened to theslide when the parts of the core withdrawing member are inserted in theslide.

2. In a machine for die casting under pressure according to claim 1, anejector frame carrying said ejector plate and lying inside said slideand arranged slidably in relation to said slide, segments on said corewithdrawing member, said ejector-frame having openings adapted to letsaid segments through, and a movable. connecting piece at the end ofsaid segments.

3. In a machine for die casting under pressure according to claim 1, anintermediate piece carrying said movable mold-portion, said slidecarrying said intermediate piece, angular levers swingingly mounted onsaid slide, and pressure screws on said slide bearing on said angularlevers adapted to clamp fast said intermediate piece on said slide bymeans of said angular levers.

4. In a machine for die casting under pressure according to claim 1, anejector-frame carrying said ejector-plate and lying inside said slideand arranged slidably in relation to said slide, hollowrods adapted tocarry said ejector-frame, rods passing through said hollow rods andeccentrics on said rods adapted to clamp fast the ejectorplate whenplaced between said eccentrics and said ejector-frame.

JAKOB VONTOBEL.

